7mm SAUM vs 30 XC
A to-scale size comparison of the 7mm SAUM and the 30 XC, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
7mm SAUM (left) beside 30 XC (right), shown at the same scale.
The 7mm SAUM has an overall length of about 2.83″ with a 0.284″ bullet. The 30 XC runs about 4.21″ on a 0.308″ bullet. That makes the 30 XC about 1.5x the overall length of the 7mm SAUM. See the full reference for each: 7mm SAUM and 30 XC.